With tomorrow’s release of the US Non-Farm Payrolls (NFP), markets are formally returning to the familiar rhythm, with the data once again published on the first regular Friday of the month. However, even though the schedule is back to “normal,” the key question remains whether the data quality has fully normalized as well.
The November report was marked by significant issues. The backdrop was the longest US government shutdown in history, which not only disrupted data collection but also delayed the release until mid-December. As a result, it is worth taking a closer look at whether distortions in the labor market data could still be influencing the December report.
Data Quality Remains in Focus
A key issue continues to be the household survey response rate. This metric has been on a structural downward trend for roughly two decades. In November, however, the decline was particularly pronounced: the response rate fell to 64%, the lowest level on record. By comparison, it stood at 68.9% in September, while the October report was skipped entirely due to the shutdown.
Ahead of the November release, the Bureau of Labor Statistics (BLS) explicitly pointed to this issue, as well as to necessary changes in composite weighting. As a result, the statistical standard error of the national unemployment rate was 1.06 times higher than usual.
While the December report is officially back to normal operations—suggesting an improvement in response rates and fewer technical distortions—market participants should remain alert, particularly if these complications unexpectedly persist.
Unemployment Rate: Technical Effects With Market Implications
Another factor that could play a role in December relates to federal employees. According to JP Morgan, a number of government workers still classified themselves as being on “temporary layoff” in November, even though the shutdown had already ended during the household survey reference week.
A statistical reversal of this effect in December could mechanically lower the unemployment rate by around 4 basis points. This matters, as markets have become especially sensitive to this metric following the unexpected jump to 4.56% in November.
Consensus expectations for December point to an unemployment rate of around 4.5% (rounded). Regardless of short-term technical effects, the broader trend remains clear:
➡️ Unemployment continues to rise, signaling a gradual cooling of the US labor market.
From a market perspective, risks therefore appear skewed to the upside. A reading closer to 4.7% (rounded) would reinforce the perception of an accelerating slowdown, with direct implications for the Federal Reserve’s policy outlook.
Weather as an Additional Factor
A new element in December—largely absent in November—is weather. Colder-than-usual temperatures were observed in several regions of the US during the payrolls reference period. While weather-related distortions are typically more pronounced in January and February, some sectors—particularly construction, leisure, and hospitality—may already have been mildly affected in December.
Market Implications: What Does This Mean for the S&P 500?
For equity markets—especially the S&P 500—the report is likely to be interpreted less as a standalone data point and more through the lens of Fed expectations.
Potential scenarios:
Weaker labor market / higher unemployment rate (≈ 4.6–4.7%)
→ Reinforces expectations of earlier or more aggressive rate cuts
→ Short-term positive for the S&P 500, particularly rate-sensitive sectors
→ At the same time, intensifies concerns about economic momentum
Stable or slightly lower unemployment rate (≈ 4.4–4.5%)
→ Confirms a slow, orderly cooling of the labor market
→ Neutral to modestly positive for equities
→ Supports the “soft landing” narrative
Unexpectedly strong data
→ Could dampen rate-cut expectations
→ Raises the risk of a short-term correction in the S&P 500, especially given strong recent performance
Overall, the dynamic remains clear: the weaker the labor market, the more supportive the backdrop for Fed easing—but the more fragile the growth signal becomes. Markets are currently balancing this trade-off very carefully.
Conclusion
Even though the Non-Farm Payrolls report returns to its regular release schedule tomorrow, this does not automatically mean that all statistical distortions have disappeared. Data quality, technical effects on the unemployment rate, and exogenous factors such as weather remain key areas to monitor.
For the S&P 500, the report is likely to matter primarily through its implications for monetary policy rather than the headline number itself. As a result, elevated volatility around the release should be expected—particularly if the unemployment rate deviates meaningfully from expectations.